Improvement in pumps



J. DENNISON.

Pump.

Patented 0m. 23, 1866.

N, PETERS, Phoio-Ulhcgnphat. Washington. BIC.

STATES PATENT OFFICE.

JOHN N. DENNISSON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELF,- FRANCIS H. GOULD, AND ROSOOE J. GOULD, OF SAME PLACE.

|MPROVEMENT IN PUMPS.

Specification forming part of Letters Patent No. 59,125, dated October 23, 1866.

To all whom it may concern:

Be it known that I, JOHN N. DENNISSON,

of Newark, in the county of Essex and State of New Jersey, have invented a new and useful Improvement in Pumps; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- I Figure 1 represents a longitudinal central section of this invention. Fig. 2 is a transverse section of the same the line as 00, Fig. 1, indicating the plane of section. Fig. 3 is an end view of the same. Fig. 4 is a transverse section of the same, taken in the plane indicated by the line 3 y, Fig. 1. Fig. 5 is a front view of the same. V l

Similar letters of reference indicate like parts. 4

This invention relates to a pump which is provided with two pistons connected to a common piston-rod, and arranged in such a manner that the quantity of water thrown at a stroke can be increased or diminished at pleasure, as fully described in Letters Patent granted to me February 7, 1865.

My present invention consists in arranging the pistons in a pump of the above description in such a manner that each of them is provided with apertures which can be opened and closed from the outside either by re: moving the follower of the piston or by turning said follower round, and either of the pistons can be taken off at any moment and put on again without opening the pump-barrel.

A represents a cylindrical barrel, which is divided in two compartments by a transverse partition, a. In each compartment is con- 1 tained a cylinder, 0 or O, and these cylinbarrel A, and they are situated between the valves I) I) c c, the motion of which will be readily understood by reference to Fig. 1 of the drawings, and requires no further explanation.

If the pistons move in the direction of the arrow marked on the piston-rodin Fig. 1, the

water, following the pistons, fills the space behind the same in the cylinders and compartments of the barrel, and the water before the pistons is forced out through the discharge-pipes, as indicated by the several arrows.

The piston B screws on the end of the piston-rod, and it.is removed by a wrench, f, which ispermanently secured in the head of the barrel A, and which catches in suitable cavities lill the piston.

By this arrangement the piston can be removed without taking off or replacing any portion of the barrel, and the piston B can be put in operation or thrown out of operation at a moments notice.

The same result is obtained in the piston B, in which the holes d are opened and closed by a disk,.g, fitting on the back of the piston and secured to a hollow shaft, h, which is fitted over the piston-rod and extends through the stuffing-box i. I

A stop, j, which is secured in the pistonrod and catches in a notch, 76, in the end of a hollow shaft, retains the disk 9 in close contact with the hack of the piston B, and pre vents the hollow shaft and disk from being turned away farther than desirable. Said disk is provided with suitable openings, and by turning it these openings can be made to coincide with the holes d, so that the piston B ceases to pump, or it is thrown out of operation.

The shaft h can be readily turned from'the outside in either direction as far as the stop j will permit, and the piston B can be thrown out of operation or put in operation at any moment.

By this arrangement of the pistons B B either or both of said pistons can be thrown out of operation or put in operation, and the quantity of water thrown at a stroke can be regulated, thereby relieving or increasing the can be put in operation or thrown out of 0plabor of the engine at pleasure. eration, substantially as and for the purposes What I claim as new and desire to secure described. by Letters Patent, is J. N. DENNISSON;

So arranging the pistons of a pump eom- Witnesses: posed of two cylinders having pistons secured WM. F. MONAMARA, to one and the same rod that either or both ALEX. F. ROBERTS. 

